How does 3D TV work?
3D movies are actually filmed in 3D using two cameras. The two perspectives of the cameras simulate the different perspectives of our left and right eyes.Different 3D TV manufacturers take slightly different approaches, and there are "active" and "passive" models to choose from (see next question). But the basic idea at work in all 3D TVs is creating "left" and "right"
versions of an image on screen. The tricky thing is getting the correct version of the image to the correct eye. That's where the 3D glasses come in.All current 3D TVs require each viewer to wear compatible glasses in order to be able to see the 3D effects. As of August 2011, most 3D TVs use battery-powered "active" glasses. The lenses alternately block out the left or right images in sync with your TV. Only your right eye sees the right image and only your left eye sees the left image. Active glasses are much more sophisticated than the ones you get at the movie theater, which is why they cost a lot more. "Passive"
glasses create separate right and left images in a different, simpler way.
Whether the 3D technology is active or
passive, your brain combines the right and left images into one seamless whole, just like it does every day with the slightly different views you get with your right and left eyes.The end result is that most people are able tosee a 3D picture.
